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I would be thinking something along the lines of a reversed snow plough. Cut the back and floor out of the old bucket, weld a few old grader blades in pointing to the centre and leave a hole the size you want your bund. Make the blades stick out further than you need and trim them back to suit. If they are too short they wouldn't gather enough dirt, too long you'd bulldoze too much and it would come over the top. If you're real keen tow a roller behind to pack it down. A tractor should clear the size your looking for, might need a bit of grunt though, an old chamberlian may not cut it. Actually, maybe leave the floor in to help stop it digging in, or skids maybe. I'm assuming the bunds would be fairly long and in open country.

At this stage for armouring the lip of erosion faces after they have been chamfered to about 20 degrees. The material then placed, either loader or hopefully side tipper (maybe belly dump...) in place. Then the loader forms it. I think it would require the bucket to be intact, if "buckled", to be able to continue to scrape up the excess material, meanwhile giving some compaction. I like the idea of a roller following, however, as most of these so far are a bit winding it would probably jump the bund too much.
All good food for thought thanks mate.